diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index 6838bf5f92..e35306b6a5 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -382,7 +382,7 @@ static int avisynth_open_file(AVFormatContext *s)
         goto fail;
     }
     if (!avs_is_clip(val)) {
-        av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip");
+        av_log(s, AV_LOG_ERROR, "AviSynth script did not return a clip\n");
         ret = AVERROR_UNKNOWN;
         goto fail;
     }